Voyager 1 mit der Geschwindigkeit, mit der sie sich im Jahr bis 2026-10-25 nach außen bewegte (JPL Horizons). Fahrt: ohne Pause, ohne je nachzutanken.
Wie er entdeckt wurde
Erster Planet, entdeckt 2011 durch Radialgeschwindigkeit und Transit (NASA Exoplanet Archive).
Seine Planeten
Kepler-20 g — 4.7 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 35 days; about 250 °C, hotter than boiling water; found in 2016 by radial velocity.
Kepler-20 c — 2.9 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 11 days; about 560 °C, hotter than boiling water; found in 2011 by transit.
Kepler-20 d — 2.6 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 78 days; about 160 °C, hotter than boiling water; found in 2011 by transit.
Kepler-20 f — 1 times Earth's width, about Earth-sized — probably rocky; its year lasts 20 days; about 410 °C, hotter than boiling water; found in 2011 by transit.
Kepler-20 b — 1.8 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 4 days; about 910 °C, hotter than boiling water; found in 2011 by transit.
Kepler-20 e — 0.8 times Earth's width, about Earth-sized — probably rocky; its year lasts 6 days; about 730 °C, hotter than boiling water; found in 2011 by transit.
NASA Exoplanet Archive, Planetary Systems Composite Parameters (fetched 2026-11-02). Composite values: where a planet's size or mass was not measured, the archive estimates it from the other.
This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.